Abstract
This paper is associated with a video winner of a 2017 APS/DFD Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.V0018
Highlights
Millimetric liquid droplets may self-propel on the surface of a vibrating fluid bath through a resonant interaction with their own wave fields [1]
For suitably chosen experimental parameters, the waves can extend substantially beyond the well boundaries even though the circular droplet trajectories remain confined to the well [Fig. 1(c)]
The fluid layer between neighboring wells supports a wave-mediated interaction between adjacent spinning droplets, which may induce spin reversals when the pair coupling is sufficiently strong. To explore whether such wave-mediated spin-spin interactions may induce coherent collective dynamics, we first investigate the motion of spinning droplets on a submerged rectangular lattice [Figs. 2(a) and 2(b)]
Summary
For suitably chosen experimental parameters, the waves can extend substantially beyond the well boundaries even though the circular droplet trajectories remain confined to the well [Fig. 1(c)] In this regime, the fluid layer between neighboring wells supports a wave-mediated interaction between adjacent spinning droplets, which may induce spin reversals when the pair coupling is sufficiently strong. The fluid layer between neighboring wells supports a wave-mediated interaction between adjacent spinning droplets, which may induce spin reversals when the pair coupling is sufficiently strong To explore whether such wave-mediated spin-spin interactions may induce coherent collective dynamics, we first investigate the motion of spinning droplets on a submerged rectangular lattice [Figs.
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